title: The preparation and characterization of chitosan rods modified with Fe3+ by a chelation mechanism.
abstract: Chitosan composite rods (CS-Fe(3+)) were prepared via an in situ precipitation method. The relationships among the preparation, structures, and properties of the CS-Fe(3+) composite rods have been investigated. The results of Fourier-transform infrared spectroscopy (FTIR) and core electron X-ray photoelectron spectroscopy (XPS) indicate that the CS and Fe(3+) are coordinated via a chelation mechanism. The content of Fe(3+) in the complex was determined by atomic absorption spectrometry (AAS) and elemental analysis (EA), the results of which suggested that the content of Fe(3+) in the complex can be controlled by the concentration of the ferric salts during coordination. The changes in thermal stability and crystallization properties were measured by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) patterns, respectively. Scanning electron microscopy (SEM) was used to observe the morphological change of the CS-Fe(3+) complex rod. After coordination with Fe(3+), the CS rod had a denser, layered structure. However, the layered structure cannot remain intact when the ratios of -NH(2)/Fe(3+) are 100/15 and 100/20. Moreover, its thermal stability decreased, and its bending strength was improved significantly (from 86 MPa to more than 210 MPa), despite the remarkable decrease in the degree of crystallinity.
authors.affiliation: Department of Polymer Science and Engineering, Zhejiang University, Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Hangzhou 310026, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Qu
authors.forename: Qiaoling
authors.initials: Q
authors.lastname: Hu
authors.forename: Kai
authors.initials: K
authors.lastname: Shen
authors.forename: Ke
authors.initials: K
authors.lastname: Zhang
authors.forename: Youliang
authors.initials: Y
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Qirong
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jieqiong
authors.initials: J
authors.lastname: Wang
authors.forename: Wenqi
authors.initials: W
authors.lastname: Quan
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D048271:Chitosan